Re: [LAU] using jdelay

On Thu, 02 Apr 2009 11:16:39 +0200
Atte André Jensen <atte.jensen@email-addr-hidden> wrote:

> Hi
>
> I tried measuring my latency with jdelay. Started in on the
> commandline, first it said
>
> Signal below threshold...
>
> Then I connected it's input to the output of system:capture_1 with my
> microphone connected and it output to the input of
> system:playback_1+2. Now I get a squareish tone and when "singing"
> into the microphone I get reading like these:
> 22442.483 Inv
> 58010.411 ??
> 43602.390 ?? Inv
> 43474.474
> 43474.474 ?? Inv
> Signal below threshold...
> Signal below threshold...
> Signal below threshold...
> 25549.731 ??
> 25549.731 ?? Inv
> 37749.225 ??
> 37749.225 ?? Inv
> 37749.225 ??
> 24653.357 ??
> 24653.228 ?? Inv
> 25677.165 ??
> 11013.134 ?? Inv
> 25677.153 ??
> 2821.046 ?? Inv
> 2821.046 ??
>
> The man page says the values are in samples, so for instance a value
> of 37749.225 should be 0.77 seconds at 48000, right? This seems bogus
> (qjackctl reports 10 ms).
>
> What am I doing wrong?
>

Hi Atte.
I made the same mistake at first.
Simply don't use a microphone, just a patch cable.
Latencies are calculated by frames/samplerate, the resulting numbers
are milliseconds.

What interface are you using? Maybe some comparison would be possible
(I have a usb interface).

Best regards,
Philipp
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Received on Thu Apr 2 16:15:01 2009